Cranking mechanism for explosive-engines



v E. N. CESAR.

CBANKING MECHANISM FOR EXIPLOSIVE ENGINE'S'.

I APPLlCATiON FILED APR.12, 1919. f 1,328,127, Patented Janl3,1920.

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ERVIN N. CESAR, OF PONCA CITY, OKLAHOMA.

CRANKING MECHANISM FOR EXPLOSIVE-ENGINES.

Specification of Letters Patent. Patented Jan, 13, 1920.

Application filed April 12, 1919. serialNo. 289,624.

To all whom it may concern:

Be it known that I, ERVIN N. CnsAn, a citizen of the United States, and a resident of Ponca City, in the county of Kay and State of Oklahoma,'havemade certain new and useful Improvements in Crank ng Mechanism for Explosive-Engines, of whlch the following is a specification.

My invention relates to a cranklng device for starting explosive engines and has for an object to produce an improved cranking mechanism which is not liable'to cause injury to the operator by preventing careless or incorrect use.

Another object is to produce a device which, if the crank should kick back as a result of premature explosion, or back-fire, injury to the operator will not ensue.

With these and other objects in View my invention consists in certain novel features of construction, arrangement and combination of parts as will be hereinafter fully described and pointed out in the claims, reference being had to the accompanying drawing, in which Figure 1 is a vertical longitudinal section of the device; 4

Fig. 2 is a front elevation of same;

Fig. 3 is a vertical transverse section on line 33 of Fig. 1;

Fig. 4 is a similar section on line 1 of Fig. 1;

Fig. 5 1s a vertlcal tranverse sectlon showing position of parts when cranking shaft and crank sleeve are freed from'each' other;

Fig. 6 is a side elevation showing means for limiting movement of tripping wheel;

Fig. 7 is an elevational view looking at the front of Fig. 6.

Referring more particularly to the drawings 10 indicates the usual cranking shaft having the usual clutch member 11 at its rear end which is used to couple with a mating clutch member on the forward end of the motor shaft usual in this type of motors. The forward end of the crank shaft is provided with a vertical slot or mortise 12 in which is pivoted an elongated and relatively thin latch or bolt 14, said bolt being normally forced upwardly by a plate spring 15, one end of which is secured to the shaft 10 at 16 and the other end of such spring being secured to' 'the bolt 14: at 17.

Mounted on the crank shaft 10 is a sleeve 18 having a circular bore and which abuts at its rear end a collar 19 on shaft 10, said sleeve having a longitudinal opening 20 through which the latch 14 may be project- On the forward end of the crank sleeve 18 a crank handle 21 is held against rotation by means of the key 22 seated in keyseats in the ring member 23 of handle 21 and in the end of the sleeve 18. The crank handle isheld on the crank sleeve against longitudinal movement by a nut 23.

The crank shaft 10 is supported in a bracket 2s rigidly secured to the front of the automobile by screws or bolts and usually at the front of the radiator, and is held in proper alinement by the bearing 25 proteeth 29 to be engaged by the pawl 27, the

bore of the wheel being eccentric, the inner surface being struck on two different circles, which develops a spiral curve 30 and straight shoulder 31 joining the ends thereof. On

the forward face of tripping wheel 28 is placed a lug 32 which may engage one side of a stop projection 33 on the periphery of the crank sleeve 18, when the tripping wheel is partly rotated on the sleeve, as plainly seen in Figs. 6 and 7.

The shaft 10 is normally forced outwardly 19, so that the shoulder 10 of the "shaft is forced against the bracket '24 and the clutch I member 11 held ,out of engagement with the clutch member of the motor shaft. 9

The sleeve 18 has in a transverse slot immediately beneath the tripping wheel 28 which begins within the face of said sleeve as at 10 and extends across the sleeve for about 180 degrees, the tapered portion 11 of this .slot forming a seat to receive the cam surface 30 within the tripping wheel.

The normal position of the parts is shown in Fig. 1, the crank shaft 10and sleeve 18 being coupled by the latch 14; the crank handle is now pushed inwardly whereupon all the parts move rearwardly against the spring 3 1 and cause the clutch element 11 to engage the clutch element of the motor shaft.

The motor shaft can now be turned as in latch 14: and forces it inwardly until it occupies the position shown in Fig. 5 in which position the shaft is then free to turn within the, sleeve 18 to which the handle is applied; and consequently the handle is not reversed or kicked back as the movements referred to are practically instantaneous. The trip wheel may then be restored to its normal position by spring means 50, a coiled spring, one end of which is fastened to the trip wheel, and the other end to the sleet e718.

From the above itwill be seen that I provide a simple, cheap and efficient cranking means and one which is perfectly safe in use and overcomes the danger of injury from back-firing or kicking of motor.

I claim 1. In a cranking device for explosive engines, the combination with an engine shaft,

of a slidably and rotatably mounted cranking shaft, clutch means for periodically coupling said shafts, a cranking sleeve rotatably mounted on said cranking shaft, a spring actuated latch carried by saidshaft and the said shaft and sleeve locked together against rotary movement, a tripping wheel mounted on said sleeve and adapted to have a certain rotary movement thereon, a stationarily held pawl engaging said tripping wheel against rotation in one direction upon reverse rotation of the cranking shaft, and

cam means within the tripping Wheel adapted to Withdraw the aforesaid latch from the cranking sleeve and permit reverse rotation of the cranking shaft within the crank sleeve.

2. In a starting device for explosive engines, the combination with the engine shaft, of a rotatably mounted and endwise sliding starting shaft, a transversely movable spring-actuated latch mounted in the shaft, a crank sleeve mounted on said shaft, and having a slot to receive said latch, a ratchet wheel rotatably mounted on said sleeve, cam means within the ratchet wheel coacting with said latch to retract samefrom the slot of the crank sleeve, and means for normally restraining the ratchet wheel against rotation in one direction.

3. A. safety crank device, comprising a slidable clutch shaft formed with a. mortise v.therethrough, a

rection and holding same against rotation in opposite direction.

4. A cranking device for explosive engines comprising a slidable and rotative crank shaft, a clutch element at its inner end, a slotted cranking sleeve, a transverse mortise in the crank shaft, a spring actuated plunger mounted in'said mortise and adapt ed to project through the slot of the sleeve, a tripping wheel mounted on said, sleeve and having an eccentric bore adapted to retract the said plunger upon rotation of the trip ping wheel in one direction and means engaging said 'tripping wheel to hold same against rotation in one direction and to permit its slipping in the opposite direction around the sleeve upon reverse rotation of the crank shaft.

nn'vnv N. cn sjan. 

